US 6,441,259 B1 · Process for the continuous preparation of tetracyclododecens

Abstract

The present invention relates to a process for the preparation of highly purified tetracyclododecenes, which can be a raw material of cycloolefin (co)polymers possessing excellent characters concerning their optical property, high transparency, heat resistance, and oil absorbency, from an inexpensive raw material of crude DCPD in a stable, continuous, and longstanding process. In the continuous preparation of tetracyclododecenes described in the present invention, it is possible to employ crude dicyclopentadiene, that is, dicyclopentadiene having low purity, as a raw material. It is also possible to produce highly purified tetracyclododecenes by maintaining the ratios of one, two, or three compounds selected from the group comprising isoprene, piperylene, and 1-methyl-2-norbornenes shown by the general formula (4) against the sum of dicyclopentadiene and cyclopentadiene within the specified ranges, wherein all these substances are contained in the raw material that are fed into a reactor.

Claims6

Dependent claims

A method of continuously preparing tetracyclododecenes comprising

(a) feeding continuously:
(1) an olefin,
(2) crude cyclopentadiene, crude dicyclopentadiene, or a mixture thereof and
(3) norbornenes into a heated reactor,
(b) circulating back to said reactor at least a part of norbornenes and cyclopentadiene, distilled out of said reactor, and
(c) maintaining the amounts of one, two, or three compounds selected from the group consisting of,
isoprene,
piperylene, and
1-methyl-2-norbornenes,
such that
Isoprene is in the range of 1-10,000 ppm
Piperylene is in the range of 1-10,000 ppm and
1-Methyl-2-norbornenes is in the range of 1-70,000 ppm said compounds being compared on a weight basis to the sum of cyclopentadiene and dicyclopentadiene present in the raw materials introduced into the reactor;
wherein said olefin is
said norbornene is
said tetracyclododecene is
and said 1-methyl-2-norbornene is
where R1 and R2 are identical or different functional groups, and are selected from the group consisting of a hydrogen atom, a methyl group, and an ethyl group.

15 more elements

A method of continuously preparing tetracyclododecenes comprising:

(a) feeding continuously
(1) an olefin,
(2) crude cyclopentadiene, crude dicyclopentadiene, or a mixture thereof and
(3) norbornenes into a heated reactor,
(b) separating olefin, cyclopentadiene, and norbornenes from the reaction mixture by distillation;
(c) circulating at least a part of olefin, cyclopentadiene, and norbornenes separated in said process of step b to the reactor;
(d) isolating dicyclopentadiene from the reaction mixture by distillation succeeding said process of step b;
and
(e) isolating tetracyclododecenes from the reaction mixture by distillation succeeding said process of step d,
such that one, two, or three compounds selected from the group consisting of isoprene, piperylene, and 1-methyl-2-norbornenes, are present, wherein
Isoprene is in the range of 1-10,000 ppm,
Piperylene is in the range of 1-10,000 ppm, and
1-Methyl-2-norbornenes is in the range of 1-70,000 ppm said compounds being compared on a weight basis to the sum of cyclopentadiene and dicyclopentadiene present in the raw materials introduced into the reactor;
wherein said olefin is
said norbornene is
said tetracyclododecene is
and said 1-methyl-2-norbornene is
and R1 and R2 are identical or different functional groups, and are selected from the group consisting of a hydrogen atom, a methyl group, and an ethyl group.

15 more elements

Dependencies are inferred from the claim text.

Process for the continuous preparation of tetracyclododecens

Life of this patent

Process for the continuous preparation of tetracyclododecens

Life of this patent

Abstract

Claims6